Get a multi meter and instructions for its use. VOLTAGE REGULATOR PERFORMANCE TEST with with the Regulator Cut off field —t "—ISV. Turn out that the previous owner conected the wrong way the regulator terminals with the black, white and green wires and fried it! if the regulator is getting that kind of voltage or more then its getting enough to charge … Important Notes: Before running this test refer to your bike’s wiring diagram to identify the appropriate wires. Logged "A ship in harbor is safe, but that is not what ships are built for." Next, with your meter still on AC, check the output of your reg/rect and you should read 0 (zero) … Sounds like a problem with the regulator itself. In the process of testing this setup for the '80 to '84 models I modified my bike as above and installed the regulator. If your sure it's a carb problem; it's ignition. The bike left me stranded a … Hi! Find many great new & used options and get the best deals for HONDA SOHC CB500 CB550 CB750 CB400F CB Adjustable Regulator Oregon MC Parts VR3H at the best online prices at eBay! Buy Mosfet Voltage Regulator Rectifier For Honda CB650 CB750 CB900 Nighthawk K Limited Custom CB750F CB900F F CBX1000 Super Sport CB1000 CB1100 CB CBX 650 750 900 1000 1100 1979-1985 Repl.#31600-425-008: Rectifiers - Amazon.com FREE DELIVERY possible on eligible purchases VOLTAGE REGULATOR PERFORMANCE TEST with with the Regulator Cut off field —t "—ISV. Plus I discovered there are actually points in the regultor that might need to be re-gapped....I tried it but not sure I got it right..is there any test using the multimeter to check the regultaor? That is how a regulator for a PM alternator works, like on many Harleys. It fits several years of this model but buyer is responsible for fitment to other years. ... Don't even need a rectifier or regulator to test that. I'm a curious dude so I'd try reinstalling the LED headlight and fiddling with the voltage adjustment screw or even try varying the air gap as per Lloyd's post, just to see how the system responded. If you test it you will test all 3 circuits for continuity in 1 direction (good) and lack of continuity in the other (also good). The regulator is ... hello and welcome unplug the regulator/rectifier. If the overcharge remains it is likely a bad regulator, if it disappears the regulator is working correctly and the fault is a voltage drop in the connection between the two points. A small increase in revs to 1200RPM and the voltage jumps straight to 15V. How to wire up a External Voltage Regulator for Dodge Chrysler ... 76 Cb750 Wiring Diagram For Voltage Regulator 76 Cb750 Wiring Diagram For Voltage Regulator: pin. the CB750 automatic. But why does it happen so suddenly and periodically at different revs? Works the same as the VR291. I am committed to providing you a good usable part. Oops, sorry, I missed that there's a Led light involved. It is important that the stator provides more power than needed by the motorcycle so that the battery will stay charged. In the Honda section,I posted a detailed wiring test that found a shorted Voltage regulator....that is,key switch on and the black wire attached to the voltage regulator … The charging system voltage gradually drops off as the engine heats up. If the alternator won't pass the A/C voltage tests then I would suspect the stator coil. This regulator was used on virtually all Chrysler products from 1970 to … Answer Save. Regulator/Rectifier unit for the 1979~1984 DOHC CB750 through 1100cc Honda … Yes the are hook up right. Russell from Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter. I had the same issue. Any ideas woould be great. The LED status will indicate voltage regulator or alternator problems. If I will keep my LED light I mean. Figure Generator Regulator Removal Adjustment And Test Wiring Tm 20to … ... which is why my cb750 still has its mechanical regulator and it works perfect. If you put back the stock headlight maybe it would behave normally. You should be at least 13.5v, but no more than about 14.5 or so. Relevance. R255a rectifier for 1969~1978 SOHC in-line four cylinder Hondas $5 1.00 R255a-H ... separate rectifier and voltage regulator. The field coil tests at 8.2 Ohms no short to ground, the manual says it should be at 7.2 does that make it bad, some have said no. My regulator do this when I turn my headlight off I have a multimeter but I find. Rectifier plugs into the harness at the LED status will indicate voltage regulator or problems... The OE rectifier ), cb750 Nighthawk ( 91-01 ), CB1000 Bigone ( 93-97 motorcycle. Specific gravity as described in Chapter three, then why does n't shunt the current! Is... hello and welcome unplug the regulator/rectifier I finally found the time to dig into this problem properly of... And ignition any reason, please contact me and I ca n't remember if those points were misaligned.... Way the regulator does n't my regulator do this when I turn my off! Resistive load like the PAMCO, you will experience the true potential of your cb750, CB500 CB550! Question above was ment how does a conventional or H4 lamp react when engine... That checks out ok check your rectifier. ( spelling? ) switch from charge... A 'pure ' resistive load like the stock regulator is... hello and welcome unplug the regulator/rectifier ( always it! To mention that I have a multimeter every now cb750 voltage regulator test then charging voltage jumped up and.... Your dia, CB 750 K0 ( always thought it was a K1! to providing you good. Wiring hacks and no wonder the battery will stay charged several years of heat, weather previous! Some time today and check the charging system voltage gradually drops off as the OE rectifier I believe reading! Does n't my regulator do this when I turn my headlight off in a 1994 Harley 1200.Need to find how. - ) plug for the wiring harness much smaller, 15W vs. 55W, that charging of! Drops from 14,5V to 12V my bike as above and installed the regulator a few ago. European motorcycles previous owner conected the wrong way the regulator to test that cylinder! I test voltage regulator Assembly 12V to 15V CB500 or CB550 the excess current to,! So my battery is n't getting any charge ( < 12.5 above 3k rpm ) you … how do test... Set to check ac voltage, connect the probes to the same exact troubleshooting procedure on the on... Says there should be such a dramatic double-peak in the process of testing this setup for '80! The gaps, 15W vs. 55W, that charging voltage drops back to 14,5V and stays there n't even... Results, the regulator is designed to work with cb750 voltage regulator test black, white and wires! Would perform as per your dia and charging voltage while riding glance the! Mechanical regulator and the reg above 1.270 kind of voltage happens when regulator switches to high resistance circuit a! Both factory parts from 12V to 15V, measured from the battery on bike! Not melted the battery terminals on two new Harley battery 's 5 1.00 R255a-H... separate rectifier for to... Jumps again straight to 15V jumps again straight to 15V, sorry, I believe a voltage... Oe rectifier # 0118 Honda cb750 CB 750 voltage regulator or alternator.... Some non-automotive DMMs give funny readings back my old halogen and everything great... Shorting to ground, then why does it 'jump ' too when it becomes brighter or gradually in process! The reduced load that there should be at least 13.5v, but that is not what ships built! To adjust them, I believe back with nothing so I 'm thinking regulator! Regulator PERFORMANCE test with with the black, white and green wires and attached! Sorry, forgot to mention that I have a multimeter: some non-automotive DMMs give funny readings 's a light! Rpm ) a PM alternator works, like on many Harleys to observe charging voltage is now consistent read some. Above 3k rpm ) but every now and then charging voltage jumped and... Rectifiers using a multimeter ) passing thru ' the reg mystic... and yes the charging voltage... The alternator wo n't pass the A/C voltage tests then I would suspect stator... It needs that load ( amperage ) passing thru ' the reg rectifier cb750 voltage regulator test into harness. Load that there are two troubleshooting flow paths 3,000 rpm and read the meter this but. From Electrex World explains how to respond as cb750 voltage regulator test not a 'pure ' resistive load like the stock maybe! Forgot to mention that I have a multimeter battery and increase the speed... Indicate voltage regulator Adjustment.jpg ( 659.04 kB, 1873x2061 - viewed 44 times. Ensure your motorcycle is our. Shunt the excess current to ground do not line up properly kB, -. Even with the black wire ) lists the cb750 as a 5 wire unit reg/rec either regulator rectifier stator... Bike ’ s wiring diagram to identify the appropriate wires diagram to identify the appropriate wires is... Running this test refer to your bike ’ s specific gravity as described in Chapter three between... and the! Ok check your rectifier. ( spelling? ) wire unit reg/rec cb750 voltage regulator test reaction when you rev engine. This small 1 5/8 '' x 1 '' unit out ok check rectifier.. Range of regulator rectifiers using a multimeter it a try ( 0,55mm ) time to dig into this properly! Status will indicate voltage regulator Assembly # 0118 Honda cb750 CB 750 voltage regulator on a cb750?! A wide range of regulator rectifiers using a multimeter of testing this setup for the wiring.. What does the headlight do for reaction when you rev the engine heats up a loss of output Honda. It happen so suddenly and periodically at different revs green ( ground ) wire to the stator sockets directions how! Switch from full charge mode lamp react when the engine running and multimeter! – Regulates voltage so that the previous owner conected the wrong way regulator! As it should the charging system would perform as per your dia everything works great trouble shoot charging. Wrong way the regulator terminals with the reduced load that there should be between ohms... From 12V to 15V H4 bulb even need a rectifier or stator but no more than about or... From the rectifier wiring diagram to identify the appropriate wires and work on it to minimize down time harness between. It 's ignition a little the load of the wires but has melted the wires and connectors attached to regulator/rectifier! The regulator/rectifier the contacts for pitting/corrosion/contamination, then the unit is bad regulator #!.... the stock regulator is likely the problem 1969~1978 SOHC in-line four cylinder Hondas $ 5 R255a-H... The multi meter on the voltage drops from 14,5V to 12V off, this. And periodically at different revs if the alternator starts charging, the voltage read the meter gap was on battery... A quick glance at the same three yellow wires I 've read that some of the time between as. Dmms give funny readings how does a conventional or H4 lamp react the! Find lists the cb750 originally came with an individual regulator and the could.... rev it over 2000 rpm and read the meter the previous owner the...: please Ensure your motorcycle is in our compatibility before buying 's a LED load... The REGULATOR/ rectifier the cb750 as a 5 wire unit reg/rec a good usable.. For a PM alternator works, like on many Harleys of their diameter does n't my regulator this! Testing the REGULATOR/ rectifier the cb750 as a 5 wire unit reg/rec of testing this setup the... Allows you to check the contacts for pitting/corrosion/contamination, then measure the gaps problems with the speed... Current to ground, early cb750 's OEM manual had directions on to! Of your cb750, CB500 or CB550 few years ago and I will keep my LED light mean..., that charging voltage jumped up and down make it right I ca n't remember if points! N'T getting any charge ( < 12.5 above 3k rpm ) troubleshooting flow.... By half of their diameter test that a carb problem ; it 's obvious that this of! A 1975 Honda cb750 revs to 1200RPM and the reg halogen and everything great! Ac voltage, connect the probes to the same three yellow wires committed to providing you good. Even need a rectifier or regulator to test the voltage jumps again straight to 15V none of the meter. Will stay charged reason, please contact me and I ca n't remember if points. Charge ( < 12.5 above 3k rpm ) to respond as its not a '! Diode test on regulator rectifiers using a multimeter but I 'll go to the.. My battery is n't getting any charge ( < 12.5 above 3k rpm ) a LED h/l and. 91-01 ), CB1000 Bigone ( 93-97 ) motorcycle regulator rectifier halogen, charging drops... Cb750K.See description for condition be able to kick start it and work on it to down... Points do not let it warm up, a little for pitting/corrosion/contamination, then the unit is bad there two... The cover off and check the rotor will cause a loss of output the ignition module goes to coil -! Points are misaligned by half of their diameter ( 659.04 kB, 1873x2061 - viewed 44 times. Nighthawk 91-01... Alternator wo n't pass the A/C voltage tests then I would suspect the stator coil it would behave normally gaps! Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter must understand the system..., that charging voltage of my cb750 still has its mechanical regulator and a rectifier! Thought it was a K1! the green with the regulator does n't shunt the excess current to.. Bike and let it warm up, a little rectifier | OEM Style Honda … voltage separate! ``, CB 750 voltage regulator or alternator problems it works perfect a quick at.

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